*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
li{
    list-style: none;
}
.container{
    background: #ffbdc9;
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

nav{
    background: #fff;
    border-radius: 50px;
    padding: 10px;
    box-shadow: 0 25px 20px -20px rgba(0,0,0,.4);
}

nav ul li{
    display: inline-block;
    padding: 13px 35px;
    margin: 10px;
    font-size: 18px;
    font-weight: 700;
    color: #777;
    cursor: pointer;
    position: relative;
    z-index: 2;
    transition: color 0.3s;
}

nav ul li::after{
    content: '';
    background: #f44566;
    width: 100%;
    height: 100%;
    border-radius: 30px;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translate(-50%,-50%);
    z-index: -1;
    opacity: 0;
    transition: all 0.3s;
}
nav ul li:hover{
    color: #fff;
}
nav ul li:hover::after{
    top: 50%;
    opacity: 1;
}